Rotary offset web-printing press



B. J. J. GOULDING ET AL' ROTAR; OFFSET WEB PRINTING PRESS Nov. 17, 1925-Filed June s, 1925 Patented Nov. 17, 1925.

UNITED STATES PATENT OFFICE.

BENJAMIN JOSEPH JOHN GOULDING, OF LONDON, AND JOHN SHUTTLEWORTH, OFALTRINCHA'M, ENGLAND. ASSIGNORS T0 LINOTYPE AND MACHINERY LIMITED,

OF LONDON, ENGLAND.

ROTARY OFFSET WEB-PRINTING PRESS.

Application filed June 5, 1925. Serial No. 35,256.

To all whom it may concern:

Be itknown that we, BENJAMIN Josnrn J OHN GOULDING, a British subject,and resident of London, England, and JOHN SHUT rLnwon'rH, a Britishsubject, and resident of Alt-rincham, in the county of Chester, England,have invented new and useful Improvements in Rotary Offset Web-PrintingPresses, of which the following is a specifi cation. l a

i This invention relates to rotary offset web printing presses and hasfor its object to provide new or improved means whereby the pressurebet-ween the impression transfer cylinders and the plate cylinders canbe ad justed for varying impression during the running of the press, andwhereby also the trilpping can be effected. special advantage attainedby the invention is the considerable saving of time which it effectswhen the press is being pre pared for printing.

It has generally been found that before the-best printing can beobtained, it is often necessary to make several variations in theadjustment of the pressures between the cylinders; this is responsiblefor considerable delay, especially as, in someinstances. the plates haveto be gummed up during the making of said adjustments, and the gum,

Washed off after the adjustments have been made and before a furthertrial can be made.

The means according to the present invention enable the pressure to betaken ed, that is to say, the surfaces to be moved out of printingcontact after the 1 cylinders have been adjusted to give what isconsidered to be the correct pressure, and, after the press has beenstarted, to be applied and gradually increased until the correct resultis attained.

The invention will now be described by reference to the accompanyingdrawings which represent a preferred constructional form of saidinvention, and in which Figure 1 is a side elevation, partly broken awayand in vertical section of the pertinent parts of a perfecting printingpress embodying the improvements, and

Figure 2 is a transverse section of the same also partly broken away,and taken substantially on the line 2-2 of Figure 1.

In the arrangement as here illustrated, the two plate cylinders 1, 1areniounted in stationary bearings 2 in the machine side frames 3, andthe two impression transfer cylinders l, 4 respectively co-operatingwith the said plate cylinders, are located between thelatter at aslightly lower level.

The two impression transfer cylinders 4, 4 which simultaneously print onrespectively opposite surfaces of the web X passed between them, areeach rotatably mounted in two eccentric bushes or bearings 5 or 5respectively. These bushes are each angularly adjustable in a block 6 or6 respectively. which is ca able of being raised and lowered in a slighty inclined direction so as to increase and decrease respectively, thepressure between the two impression transfer cylinders 4L, 4 themselves,and between them and the plate cylinders 1, 1.

Each of the eccentric bushes 5, 5, is nor mally secured to its slidingblock, 6, 6, by a clamping bolt 7 threaded into the latter andpenetrating a curved slot in the flange of the former so that when saidbolts are released, the bushes can be turned angular-1y in the resective blocks. This turning of the bus es 5, 5 may be convenientlyeffected by means of eccentrics 8, each engaging a notch in therespective flange, and these means enable the pressure between therespective impression transfer c linder 4 or P and cooperating platecyhnder l or 1, to be adjusted independently of the other correipondingpair of cylinders. As shown in igure 2, each of the eccentrics 8 is fastto ashaft 9 journalled in the respective block 6 or 6* and provided witha squared end 10 for the reception of a key by which it can be turned.

Each of the sliding blocks 6, 6, is connected as by a pin 11 to theupper end of an inclined screw rod 12 axially movable in guides 13, 14,15, on the respective side frame 3, and on whose lower end is threadedthe internally screwed boss of a spiral gear wheel 16. This wheel 16meshes with a companion wheel 17 fixed with a capacity for angularadjustment, on a horizontal shaft 18 which is common to both of thescrew rods 12 at the same side of the press, it being ex plained thatwhat is here described for adjusting the impression transfer cylinders1, 1 at one end, is duplicated, as shown in Figure 2, at the other sideof the press for correspondingly adjusting the opposite ends of saidcylinders. To permit of the just-named angular adjustment, the so-calledcompanion wheel 17 is formed'in two parts, one part (the hub) rigidlyattached, as by a key 19, (Figure 1) to the horizontal shaft 18 and theother part (the felly) attached to the hub as by slot and boltconnections 20, (see particularly the left-hand part of Figure l) whichenable it to be clamped to it in different angular positions.

The horizontal shaft 18 is operatively con nected, as by bevel gearing21, with a cross shaft 22, which operatively connects together thehorizontal shafts 18 at the two sides of the press, and this cross shaftis provided with a hand wheel whose rim is preferably graduated or asshown, peripherally notched, so that, conjointly with a fixed yieldingdetent or pointer 24-, it will give indications of degrees of pressurewhich will enable the operator to adjust said pressure according torequirements, and, for this purpose the rim of the hand wheel 23 maybear any desired scale markings.

Each of the before mentioned wheels 17 meshes with a gear 25 secured toa transverse shaft 26 having fast on its respectively opposite ends atommy head or equivalent device 27 by which it can be turned after thesaid whee 17 has been, for this purpose, released from the respectivehub, this turning of the shaft 26, serving for effecting impressionadjustments of the respective impression transfer cylinders at, l,independently of each other. After this adjustment has been made, thefellies are again tightly clamped to the respective hubs so that anysubsequent turning of the hand wheel 28 will affect both of theimpression transfer cylinders 4, equally.

It will be observed that the bolt and slot connections20 also provide aready means of effecting any desired initial adjustment of either end ofa cylinder a relatively to the other end, and that by virtue of thecharacter of the means for laterally adjusting the impression transfercylinders, said cylinders will be locked in any position of theirlateral adjustment.

Having described our invention, we de clare that what we claim anddesire to secure by Letters Patent is 1. In a rotary offset web printingpress, the combination of two plate cylinders mounted in stationarybearings, two impression transfer cylinders located between them at alower level, screw mechanism adapted to adjust each impression transfercylinder to vary the pressure relationship between the cylinders duringthe running of the press, and means adapted to effect the saidadjustment of the two impression transfer cylinders simultaneously andto the same extent.

2. In a rotary offset web printing press, thecombination of two platecylinders tween the cylinders during the running of the press.

3. In a rotary offset web printing )ress, the combination of two platecylinders mounted in stationary bearings, two inn pression transfercylinders located between them at a lower level, gear-actuated screwmechanism adapted to adjust the two inipression cylinders simultaneouslyand to the same extent during the running of the press for varying thepre'sure relationship between the cylinders during'the running thepress, and releasable devices which permit adjustment of either of theimpression transfer cylinders independently of the other.

l. In a rotary offsetweb grinting press, the combination of two platecylinders mounted in stationary bearings, two impressions transfercylinders located between them at a lower level, gear actuated screwmechanism adapted to adjust the two impression cylinders simultaneouslyand to the same extent during the running of the press for varying thepressure relationship between the cylinders during the running of thepress, and releasable devices which permit adjustment of either of theimpression transfer cylinders independently of the other and either endof each of said cylinders independently of the other end.

5. In a rotary offset web printing press, the combination of two platecylinders mounted in stationary bearings, two impression transfercylinders located between them at a lower level, a bearing block at eachend of each impression transfer cylinder, guides in which said blocksare slidable in an inclined direction, an axially movable inclined rodsecured to each of said bearing blocks, and gear-actuated screwmechanism adapted to axially move all of said rods simultaneously and tothe same eX- tent during the running of the press.

6. In a rotary offset web printing press, the combination of two platecylinders mounted in stationary bearings, two impres sion transfercylinders located between them at a lower level, a bearing block at eachend of each impression transfer cylinder, guides in which said blocksare slidable in an inclined direction, an axially movable inclined screwrod secured to each of said bearing blocks, an internally screwed gearwheel threaded on the lower end of each rod and gearing adapted torotate all of said gear wheels simultaneously and to the same extent.

7. In a rotary offset weh printing press, the combination of two platecylinders mounted in stationary hearings, two impression transfercylinders located between them at a lower ievel,'a hearing block at eachend of each impression transfer cylinder, guides in which said blocksare slidahle in an inclined direction, an axially movable inclined screwrod secured to each of said bearing loloclzs, an internally screwed gearwheel threaded on the lower end of each rod, a horizontal shaft at eachside of the press, a pair of gear wheels on each of the said shaftsmeshing with the two internally screwed gear wheels at the respectiveside, means adapted to effect independent angular adjustment of the gearwheels on the shafts, and gearing adapted to rotate the two horizontalshafts simultaneously.

8. in a rotary oi'fset web printing press, the combination of two platecylinders mounted in stationary hearings, two impression transfercylinders located between them at a lower level, a bearing block at eachend clined screw rod secured to each of said bearing blocks, aninternally screwed gear wheel threaded on the lower end of each rod, ahorizontal shaft at each side of the press, a pair of gear wheels oneach of the said shafts meshing with the two internally screwed gearWheels at the respective side, means adapted to effect independentangular adjustment of the gear wheels on the shafts, gearing adapted torotate the two horizontal shafts simultaneously, two independentlyrotatable transverse shafts, and a pair of gear wheels on each of saidtransverse shafts meshing with the gear wheels on the horizontal shaftsat respectively opposite sides of the press. 1

In witness whereof we have aflixed our signatures hereto.

BENJAMIN JOSEPH JOHN GOULDING. JOHN SHUTTLEWORTH.

